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这是原文
In this circuit, the renowned timer chip LM555 (IC1) is used as a PWM circuit. The whole circuit can be powered from a standard 12VDC supply, capable of sourcing ample current to the PCB drill motor. As you may noted, power supply for the PWM circuit is down-converted and regulated with the help of a 3-pin fixed regulator chip LM7805 (IC2). This will improve the circuit stability. Precision 50K trimpot P1 is the variable drill speed controller. Finally, a logic-level power Mosfet IRL 530N (T1) is used as the output drive element. This IRL530N mosfet (available in TO-220 package) can handle current upto 27A! Fast switching and Low on-resistance – RDS (on) – are other attracting features. IRL 530N is universally preferred for all commercial-industrial applications at power dissipation levels to approximately 50 watts.
Drill Speed Controller Notes- PWM (Pulse Width Modulation) is an efficient way to vary the speed and power of electric DC motors. The described circuit can be used to vary the speed of small electric PCB drill.The circuits can quite easily be built on a standard prototyping board. The power component (IRL510N) must be connected to the power rails and the drill motor with quite thick wires and cables.
As used here, a Power MOSFET motor driver is better than the traditional driver because it is working at a higher switch frequency, and this also avoids the unnecessary voltage drop and power loss - Electrically a DC motor can be viewed as a series RL network with a voltage generator. The generator represents the back electromotive force (BEMF) generated by the motor’s rotation and which opposes the electromotive force of the supply. Diode D3 (1N4007) is added to protect the electronics from BEMF. Diode “MBR 1645” is a better alternative
- STP22NE10L (100V/<0.085R/22A) can be used in lieu IRL510N (100V/0.10R/17A)
- 12VDC /2A powered prototype tested with a 12V (1A) Small PCB Drill Press
这是百度翻译的。
在该电路中，著名的定时器芯片LM555（IC1）用作PWM电路。整个电路可以从标准的12VDC电源供电，可输出足够的电流到PCB钻机马达的。正如你可能注意到，对于PWM电路电源下转换，并与3针固定稳压芯片LM7805（IC2）的帮助下调节。这将提高电路的稳定性。精密微调电位计50K P1是变量钻速度控制器。最后，一个逻辑电平的供电Mosfet IRL 530N（T1）被用作输出驱动元件。这IRL530N MOSFET（在TO-220封装）可以处理当前高达27A！快速开关和低导通电阻 - RDS（ON） - 其他吸引的特性。 IRL 530N普遍首选的约50瓦特所有商业工业应用中的功耗水平。
钻速度控制器的注意事项
PWM（脉宽调制）是改变的电动直流电动机的速度和功率的有效方法。所描述的电路可以用来改变的小型电动PCB drill.The电路的速度可以很容易地建立在一个标准的原型板。的功率成分（IRL510N）必须连接到电源轨和相当厚的电线和电缆的钻机马达。
如这里所使用的，功率MOSFET马达驱动器比传统的驱动器更好，因为它是工作在更高的开关频率，这也避免了不必要的电压降和功率损耗
电DC马达可以被看作是一个系列的RL网络与一个电压发生器。发电机表示由马达的旋转和相对向的供给的电动势产生的反电动势（BEMF）。二极管D3（1N4007）加入，以保护电子设备免受反电动势。二极管“MBR 1645”是一个更好的选择
STP22NE10L（100V / <0.085R / 22A）可以代替IRL510N使用（100V / 0.10R / 17A）
12VDC / 2A电源样机具有12V（1A）小PCB钻床测试。。。
